<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>includes方法</title>
</head>
<body>
<script type="text/javascript">
    let ary = ["a", "b", "c"];
    let result = ary.includes('a')
    console.log(result)
    result = ary.includes('e')
    console.log(result)
</script>
</body>
</html>
